Fuse-plug.



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Fusg PLUG. APPLICATlON FILED 5.25. ms.

Patent-ed Apr. 1,191.9

INVENTOR.

WITNESSES A TTO'RNEY.

UNITED stares PAENT DAVID E. BOWN. OF PITTSBURGH, PENNSYLVANIA.

FUSE-PLUG.

Application filed April '25, 1918.

To all whom at may concern:

Be it known that I. DAVID Bowx, a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania. have invented a new and useful Improvement in Fuse-Plugs, of which the following is a specification.

This invention relates to fuse plugs. invention has; for its object to provide a fuse plug of simple construction and hence cheap to manufacture. which can be quickly and conveniently assembled at a minimum labor cost, which is so constructed that the fuse can be renewed when blown out without destroying the body, and which possesses other advantages hereinafter described.

The invention comprises a fuse plug constructed as hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a longitudinal central section of the improved fuse plug; Fig. 2 is a top plan view of the same; and Fig. 3 is a bottom plan view of the same.

As illustratechthe plug comprises an integral cup-shaped body portion 1, which can be formed of any suitable insulating material, such as the well known moldable or pressed compositions known in the electrical art, or fiber. The body is slotted vertically from its upper edge as at 3, to allow for the passage of the fuse wire l when assembling, and the bottom ofthis hollow body carries a center contact 2, which is shown as a hollow rivet flanged both inside and outside of the bottom 2.

This cup-shaped body is closed by means of a cover 5 which is provided with a window 6 and which clamps against the upper end of the body a suitable transparent diaphragm 7; such as a disk of mica. The cover is provided with depending flanges 8 which surround and telescope the body and extend down toward but not quite tothe bottom of the vertical slot 3. The outer contact is in the form of a screw threaded shell 9 which is suitably secured to the depending fiangesS of the cover. such as by means of the hollow rivets 10. The upper edge of this shell is bent inwardly so as to be in firm contact with the outer surface of the body. and said edge is preferably serrated Specification of Letters latent.

T he

Patented Apr. 1, Milli.

Serial No. 230.654.

8 of the cover provided with an opening 12 through which the end of the fuse wire projects. This fuse wire can be secured to the center contact in any suitable way, such as bv means of soldering, as indicated at -a plug which is light but nevertheless strong.

The center contact 2 is secured to the cupshaped body before assembling by a simple upsetting process. and the screw shell 9 is also secured to the dependin flanges 5 of the cover before assembling by a simple riveting process, after the mica disk 7 has been glued in place. To assemble the plug. the fuse wire which will be on a spool will be threaded through the opening 12 in the shell before the cover and body are assembled, its end then secured to the contact 2, after which the body is slipped up into the shell and the cover brought tightly down against the mica disk. The excess length of fuse is then drawn outwardly through the opening 12 and the end of the portion in the plug is pinched off and soldered at 'l-l. The serrated upper edge of the shell bites into the walls of the body and holds the parts in firm-assembled position. The connection of the fuse with the shell at ll also assists in holding the parts together.

The upper edge of the body is serrated. as indicated at 15, so as ,to allow for venti lation and the escapeof the gases when the fuse blows.

What I claim is v 1. A fuse plug comprising a cup-shaped body. a center contact carried by the bottom thereof. a cover for said body provided with a window and with depending flanges telescoping the body a screw shell secured to said flanges and novi'ded with an opening. and a fuse wire secured to the center contact and extending through the opening in the shell and secured thereto.

2. A fuse plug comprising a cup-shaped body, a center contact carried by the botthe body, a screw flanges, the upper end of said screw shell prongs to engage tom thereof, a cover provided with a window and with depending fianges'telescoping shell secured to said tom thereof, a cover provided with a window and -with depending flanges telescoping the'body, and a screw shell secured to said flanges and provided with an opening for the passage of the fuse wire, the upper end ofsaid screw shell being contracted and firmly engaging the outer surface of said body.

4. A fuse plug comprising a cup-shaped body slotted from its upper end downwardly, a center contact carried by the bottom of said body, a cover provided with awindow and with depending flanges telescoping the body, and a screw sh'ell secured to said flanges and provided with an opening for the passage of the fuse wire.

5. A fuse plug comprising a cup-shaped body slotted from its upper end downwardly, a. center contact carried by the bot tom of said body, a cover provided with awindow and with depending flanges telescoping the body, and a screw shell secured to said flanges and provided with an opening for the passage of the fuse Wire, the upper end of said screw shell being contracted and firmly engaging the outer surface of said body.

In testimony whereof, I have hereunto set my hand.

DAVID E. BOVVN.

Witness GLENN H. LERESCHE. 

